Good point, as long as it's in a form that doesn't violate the NAP. I still heavily disapprove of it though, and prefer to avoid doing business with businesses that discriminate against people, especially if those people are costumers, which I would consider to be a borderline NAP violation since it may push out other businesses that would otherwise serve them while refusing to serve them themselves, specifically important in areas like food and healthcare. I'm not sure refusing to bake a cake for a gay marriage should be illegal, though, if I'm being honest, since no one is going to die from not eating cake with the right plastic figurines, and it is not impossible to bake one's own cake if no alternative is available. If they are discriminating, though, it is likely they would want to discriminate against me as well anyway, since I am also gay (or maybe bisexual), mixed black/white (and since we are not on Reddit, I can admit there can be discrimination against both depending on where one is), and on the autistic spectrum, which people sometimes discriminate against, but thankfully usually mildly in my experience, so perhaps I am doing them a favour by not doing business with them. Smart businesses will accept everyone and get more money, and hire whoever is most competent regardless of whatever group they are in and become more productive.

Edit: As for other forms of discrimination, violence like lynching is DEFINITELY a NAP violation, as well as police violence. I would consider those more of a separate issue from discrimination though, that is unfortunately sometimes caused by it.